Electrically focus-tuneable ultrathin lens for high-resolution square subpixels

Sehong Park, Gilho Lee, Byeongho Park, Youngho Seo, Chae bin Park, Young Tea Chun, Chulmin Joo, Junsuk Rho, Jong Min Kim, James Hone, Seong Chan Jun

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


Owing to the tremendous demands for high-resolution pixel-scale thin lenses in displays, we developed a graphene-based ultrathin square subpixel lens (USSL) capable of electrically tuneable focusing (ETF) with a performance competitive with that of a typical mechanical refractive lens. The fringe field due to a voltage bias in the graphene proves that our ETF-USSL can focus light onto a single point regardless of the wavelength of the visible light—by controlling the carriers at the Dirac point using radially patterned graphene layers, the focal length of the planar structure can be adjusted without changing the curvature or position of the lens. A high focusing efficiency of over 60% at a visible wavelength of 405 nm was achieved with a lens thickness of <13 nm, and a change of 19.42% in the focal length with a 9% increase in transmission was exhibited under a driving voltage. This design is first presented as an ETF-USSL that can be controlled in pixel units of flat panel displays for visible light. It can be easily applied as an add-on to high resolution, slim displays and provides a new direction for the application of multifunctional autostereoscopic displays.

Original languageEnglish
Article number98
JournalLight: Science and Applications
Issue number1
Publication statusPublished - 2020 Dec 1

Bibliographical note

Publisher Copyright:
© 2020, The Author(s).

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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